Last trip to the grocery store I couldn't find any non-US salad kits, and Silk NextMilk is made down there now, because I guess our plants were the listeria ones. Chip dip was surprisingly hard to find too, although I did it.
I'm very pleased with how many vegetables actually come from Mexico (definitely via the US though), and there's even a few things you can get from greenhouses, so that situation is less dire than I'd expected.
It's not really cost effective versus buying separate but way cheaper than going to a salad place and it saves stocking space for different toppings and dressings. We started eating more salads because we dont have to eat the same kind daily.
Thank you, as OP I was getting ready to defend why I can't just make my own salad against an angry European purist, haha.
Every salad I personally make is ass in comparison - if I even bother on a busy day and with the hand issues I have. The ratios of things included are just right, there is (well, there was) a good variety available, and you don't have to cut, wash and potentially roast a bunch of stuff for it because a big machine somewhere already did.